Explosion-proof plate and battery

Abstract

To overcome the technical problem of existing explosion-proof discs experiencing severe deformation that reduces battery safety, the present application provides an explosion-proof disc and battery. The disc comprises a bursting body having a weak area and multiple reinforcing ribs formed thereon. The reinforcing ribs form a groove on one side of the bursting body and a protrusion on the other side of the bursting body. The reinforcing ribs at least partially enclose a reinforced area, and a portion of the reinforced area contracts toward the center of the reinforced area. The explosion-proof disc provided by the present application improves the structural strength of the disc, reduces deformation, and maintains the stability of the burst pressure threshold.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to an explosion-proof sheet and a battery. Background Art

[0002] Lithium-ion batteries, with their high energy density, high voltage, long life, low self-discharge rate, and environmental friendliness, are widely used in electric vehicles, ship propulsion, industrial and household energy storage, and other fields. For battery safety, an explosion-proof valve is typically installed on the lithium-ion battery cover. Within the explosion-proof valve is an explosion-proof disc with a notch, which represents the disc's weakest point. When the internal pressure of the battery reaches a certain value—that is, when the internal pressure increases and exceeds the disc's opening pressure—the disc ruptures at the notch to release pressure, releasing the internal pressure and preventing further pressure buildup that could lead to battery explosion, thereby ensuring battery safety. Therefore, the performance of the explosion-proof disc is particularly important, ensuring both compressive strength during normal battery use and timely pressure relief when the disc's threshold is reached. The explosion-proof disk in the prior art is thin in thickness and poor in anti-deformation strength. The reinforcing ribs arranged in the explosion-proof disk are mostly two semicircular structures connected to the notches. Although they can increase the anti-deformation strength, the anti-deformation strength is still low. When used in power batteries, the pressure inside the battery changes due to the operating conditions, which can easily cause the explosion-proof disk itself to undergo expansion and contraction deformation, affecting the rupture pressure at the notch. The blasting pressure value of the explosion-proof disk increases, reducing the safety performance and service life of the battery. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the existing explosion-proof plate has low deformation resistance and undergoes severe deformation, which reduces the safety performance of the battery. The present application provides an explosion-proof plate and a battery.

[0004] The present application provides an explosion-proof piece, wherein a weak area and multiple reinforcing ribs are formed on the blasting body, the reinforcing ribs form grooves on one side of the blasting body, and the reinforcing ribs form protrusions on the other side of the blasting body, the reinforcing ribs at least partially enclose a reinforced area, and a part of the reinforced area shrinks toward the middle of the reinforced area.

[0005] Preferably, the plurality of reinforcing ribs do not intersect with the outer periphery of the blasting body, and the plurality of reinforcing ribs enclose the reinforced area, and the reinforced area includes two first deformation zones, the two first deformation zones are connected, and the area of ​​the first deformation zone shrinks in a first direction toward the direction where the two first deformation zones are connected;

[0006] Alternatively, a plurality of the reinforcing ribs enclose the reinforcing area, and the reinforcing area includes a second deformation zone and two first deformation zones, the second deformation zone is arranged between the two first deformation zones, and in a first direction, the first deformation zone shrinks toward a direction close to the second deformation zone.

[0007] Preferably, the plurality of reinforcing ribs are respectively an arc-shaped reinforcing rib group and a strip-shaped reinforcing rib group, the arc-shaped reinforcing rib group includes a plurality of first arc-shaped reinforcing ribs and a plurality of second arc-shaped reinforcing ribs, the plurality of first arc-shaped reinforcing ribs are respectively located at both ends of the blasting body, the strip-shaped reinforcing rib group includes a plurality of linear reinforcing ribs, the plurality of linear reinforcing ribs are located between the plurality of first arc-shaped reinforcing ribs, and the two ends of each first arc-shaped reinforcing rib are respectively connected to the linear reinforcing rib, and the plurality of linear reinforcing ribs intersect at one point.

[0008] Alternatively, the extension lines of the plurality of linear reinforcing ribs intersect at one point, and the two linear reinforcing ribs on the same side are connected by the second circular arc reinforcing rib.

[0009] Preferably, the plurality of first arc reinforcing ribs are respectively the first semi-circular arc reinforcing ribs and the second semi-circular arc reinforcing ribs, the plurality of second arc reinforcing ribs are respectively the first arc segment adjustable reinforcing ribs and the second arc segment adjustable reinforcing ribs, and the plurality of straight line reinforcing ribs are respectively the first straight line segment reinforcing ribs, the second straight line segment reinforcing ribs, the third straight line segment reinforcing ribs and the fourth straight line segment reinforcing ribs;

[0010] The first semicircular arc reinforcement rib and the second semicircular arc reinforcement rib are respectively located at two ends of the blasting body, and the center of the first semicircular arc reinforcement rib and the center of the second semicircular arc reinforcement rib are located between the first semicircular arc reinforcement rib and the second semicircular arc reinforcement rib; the first straight segment reinforcement rib and the second straight segment reinforcement rib are respectively connected to the two ends of the first semicircular arc reinforcement rib to form a first deformation zone; the third straight segment reinforcement rib and the fourth straight segment reinforcement rib are respectively connected to the two ends of the second semicircular arc reinforcement rib to form another first deformation zone;

[0011] The first straight segment reinforcement rib and the third straight segment reinforcement rib are arranged on the same side, and the first straight segment reinforcement rib and the third straight segment reinforcement rib are connected by the first arc segment adjustable reinforcement rib. The second straight segment reinforcement rib and the fourth straight segment reinforcement rib are arranged on the same side, and the second straight segment reinforcement rib and the fourth straight segment reinforcement rib are connected by the second arc segment adjustable reinforcement rib. The second deformation zone is formed between the first arc segment adjustable reinforcement rib and the second arc segment adjustable reinforcement rib.

[0012] Preferably, the extension lines of the first straight segment reinforcement rib, the second straight segment reinforcement rib, the third straight segment reinforcement rib and the fourth straight segment reinforcement rib intersect at one point, and the intersection point is located on the line connecting the centers of the first semicircular arc reinforcement rib and the second semicircular arc reinforcement rib.

[0013] Preferably, the weak area is arranged on the periphery of the reinforcing rib, or the weak area is arranged on the periphery of the blasting body, and the weak area includes at least one groove, and the cross section of the groove is trapezoidal or V-shaped.

[0014] Preferably, the explosion-proof disk further comprises a fixing portion, the fixing portion being arranged on the outer periphery of the blasting body, and the weak zone being arranged at the connection between the fixing portion and the blasting body; the fixing portion has a runway-shaped structure, and when the number of the groove is one, the groove is annular or arc-shaped;

[0015] When there are multiple grooves, each groove is arc-shaped, and multiple grooves are arranged at intervals at the connection between the blasting body and the fixing part.

[0016] Preferably, the groove includes a first groove and a second groove, the depth of the first groove is smaller than the depth of the second groove, and the first groove and the second groove are spaced apart.

[0017] Preferably, a first semicircular arc segment and a second semicircular arc segment are provided at both ends of the fixing portion, the center of the first semicircular arc segment and the center of the second semicircular arc segment are located between the first semicircular arc segment and the second semicircular arc segment, and the projections of the center of the first semicircular arc segment, the center of the second semicircular arc segment, the center of the first semicircular arc reinforcement rib and the center of the second semicircular arc reinforcement rib in the direction of the blasting body are located on the same straight line.

[0018] Preferably, the first arc reinforcement rib, the second arc reinforcement rib and the straight reinforcement rib are all stamped, and the convex height of the outer side of the first arc reinforcement rib, the convex height of the outer side of the second arc reinforcement rib and the convex height of the outer side of the straight reinforcement rib are all 0.08mm~0.12mm, and the width of the outer side of the first arc reinforcement rib, the width of the outer side of the second arc reinforcement rib and the width of the outer side of the straight reinforcement rib are all 0.3mm-0.6mm.

[0019] Preferably, the explosion-proof disk includes at least one of the following technical features a to k:

[0020] a. The weak area has a groove, the groove is annular as a whole or annular with a gap;

[0021] b. The reinforcing ribs and the reinforcing area are located within the weak zone and are located within the annular portion formed by the groove;

[0022] c. The explosion-proof disk has a runway-shaped shape as a whole;

[0023] d. The width-to-length ratio of the runway-shaped explosion-proof disk is 1 / 3 to 2 / 3;

[0024] e. The weak area has a groove, the groove is annular as a whole or annular with a gap, the annular or the annular with a gap has a runway shape;

[0025] f. The reinforcing ribs enclose a reinforced region forming a closed loop, or the reinforcing ribs enclose a reinforced region forming a mostly closed loop having a gap;

[0026] g. The shape of the strengthening region before contraction is runway-shaped, and the contraction region of the strengthening region is at least one side of the runway-shaped straight edge region;

[0027] h. The reinforced region has a runway-shaped shape before shrinkage, and the shrinkage region of the reinforced region is on both sides of the runway-shaped straight-edge region; the minimum diameter of the shrinkage region after shrinkage is 1 / 6 to 1 / 2 of the width before shrinkage;

[0028] i. The strengthening region is in a runway-shaped shape before shrinkage, and the shrinkage region is the entire straight-edge region of the runway-shaped straight-edge region;

[0029] j. The minimum diameter of the contraction area is located in the middle of the burst disk;

[0030] k. The weak area has a groove, and the groove is in the shape of a runway ring as a whole or a runway ring with a notch. The shape of the reinforced area before shrinkage is runway-shaped. The shrinkage area of ​​the reinforced area is the entire straight-edge area of ​​the runway-shaped straight-edge area. The distance between the runway-shaped area of ​​the reinforced area before shrinkage and the grooved runway ring is 1 / 5 to 3 / 5 of the width of the grooved runway ring.

[0031] In another aspect, the present application provides a battery comprising the explosion-proof disk described above.

[0032] Beneficial effects:

[0033] Compared with the prior art, the explosion-proof piece provided by the present application includes a blasting body, on which a weak area and a plurality of reinforcing ribs are formed, the reinforcing ribs at least partially enclose a reinforced area, and part of the reinforced area shrinks toward the middle of the reinforced area. By shrinking part of the area, the internal area of ​​the reinforcing ribs is also relatively strengthened, which can provide more sufficient deformation space for the explosion-proof piece, thereby improving the problem that "when the internal pressure of the battery changes (not reaching the specified range), the shrinkage and deformation causes the "material fatigue at the notch" to rupture and open the valve prematurely, causing the battery to be scrapped". The explosion-proof piece provided by the present application, while improving the structural strength of the explosion-proof piece, also prevents or reduces the occurrence of deformation of the explosion-proof piece, ensures the stability of the blasting pressure threshold, and when the internal pressure of the battery increases to the threshold of the explosion-proof piece, the explosion-proof piece ruptures normally, so that the gas inside the battery is released, thereby ensuring the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the explosion-proof disk structure provided in the first embodiment of the present application;

[0035] Figure 2 is a cross-sectional view of the explosion-proof disk provided in the first embodiment of the present application;

[0036] Figure 3 The first embodiment of this application provides Figure 2 Enlarged view of part A;

[0037] Figure 4 This is a schematic diagram of the explosion-proof disk structure provided in the fourth embodiment of the present application;

[0038] Figure 5 is a cross-sectional view of a burst-proof disk provided in a fourth embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of the explosion-proof disk structure provided in the third embodiment of the present application;

[0040] Figure 7 This is a cross-sectional view of the explosion-proof disk provided in the third embodiment of the present application.

[0041] Among them, 1. Fixed part; 2. Blasting body; 3. Reinforcement ribs; 301. First semicircular arc reinforcement ribs; 302. Second semicircular arc reinforcement ribs; 303. First arc segment adjustable reinforcement ribs; 304. Second arc segment adjustable reinforcement ribs; 305. First straight segment reinforcement ribs; 306. Second straight segment reinforcement ribs; 307. Third straight segment reinforcement ribs; 308. Fourth straight segment reinforcement ribs; 4. Grooves; 41. First grooves; 42. Second grooves; 5. Grooves. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] In order to illustrate the technical solution of the present invention, specific embodiments are provided below.

[0044] like Figure 1-Figure 7 As shown, the present application provides an explosion-proof piece, which is installed in the explosion-proof valve of the battery top cover and is used to release the expanded gas inside the battery to avoid the risk of battery explosion caused by excessive internal pressure of the battery. The explosion-proof piece includes a fixed part 1 and a blasting body 2. The fixed part 1 is arranged on the periphery of the blasting body 2, and a reinforcing rib 3 is formed on the blasting body 2. The explosion-proof piece includes a fixed part 1, which is generally thick and is used to be installed and welded in the corresponding explosion-proof groove on the battery shell or the battery top cover. When the pressure inside the battery is too high and exceeds the threshold of the explosion-proof piece, the blasting body 2 ruptures, and the gas inside the battery is released, reducing the pressure inside the battery and ensuring the safety performance of the battery.

[0045] A weak area and multiple reinforcing ribs 3 are formed on the blasting body 2. The reinforcing ribs 3 are grooved on one side of the blasting body 2, and protruded on the other side of the blasting body 2. These ribs can improve the structural strength of the explosion-proof disk, reduce the deformation of the explosion-proof disk, maintain the stability of the blasting pressure threshold, and ensure the safety performance of the battery.

[0046] The reinforcing ribs 3 at least partially enclose a reinforced area, with a portion of the reinforced area shrinking toward the center of the reinforced area. This partial shrinkage strengthens the interior of the ribs 3, providing more room for deformation of the explosion-proof disc. This, in turn, alleviates the problem of premature valve opening caused by fatigue rupture at the notch and resulting in battery failure when the battery's internal pressure fluctuates (below the specified range).

[0047] Specifically, the reinforcing ribs 3 at least partially enclose a reinforced area. The reinforcing ribs 3 may be configured to form a closed reinforced area, or the reinforcing ribs 3 may partially enclose a relatively closed reinforced area with a gap, i.e., a gap is provided on the basis of a closed reinforced area. The reinforced area shrinks toward the middle of the reinforced area, i.e., the reinforced area shrinks toward the inside of the reinforced area, or it can also be understood that the reinforced area shrinks toward the inside of the reinforced area. Figures 1 to 3 In the specific embodiment, the reinforcing ribs 3 form a closed racetrack-shaped reinforcement area that shrinks relative to the inner side.

[0048] Specifically, the multiple reinforcing ribs 3 do not intersect with the outer periphery of the blasting body 2, and the multiple reinforcing ribs 3 enclose the reinforced area, which includes two first deformation zones. The two first deformation zones are connected, and in the first direction, the first deformation zone shrinks toward the direction close to the connection between the two first deformation zones.

[0049] Or multiple reinforcing ribs 3 enclose the reinforcing area, and the reinforcing area includes a second deformation zone and two first deformation zones. The second deformation zone is arranged between the two first deformation zones, and the first deformation zone shrinks toward the direction close to the second deformation zone in the first direction.

[0050] like Figure 1 As shown, the first direction is the length direction of the explosion-proof disc, and the width direction of the explosion-proof disc is perpendicular to the first direction. Specifically, the length of the explosion-proof disc is longer than the width of the explosion-proof disc. In the first direction, the two first deformation zones are connected, which means that the two first deformation zones intersect, and the intersection can be a straight line or a point. And the two first deformation zones shrink toward the direction where the two first deformation zones are connected. The second deformation zone is located between the two first deformation zones, and the two first deformation zones shrink toward the direction where the two first deformation zones are connected. It can be understood that the area of ​​the second deformation zone can be smaller than the area of ​​at least one first deformation zone, or the area of ​​the second deformation zone can be larger than the area of ​​at least one first deformation zone. Similarly, the areas of the two first deformation zones are the same, or the areas of the two first deformation zones are different. It should be understood that the figure shows an example of an explosion-proof disc in the shape of a runway. Of course, the explosion-proof disc of the present application is also applicable to the case of a circular explosion-proof disc.

[0051] Furthermore, a third deformation zone is formed on the blasting body 2 and located on the periphery of the reinforcement rib 3. The third deformation zone facilitates timely valve opening within a limited pressure range. The two first deformation zones located within the reinforcement rib 3 are surrounded by multiple reinforcement ribs 3. The reinforcement ribs are evenly distributed and moderately reinforced, which can follow the third deformation zone and open the valve in a limited pressure range in a timely manner, thereby improving the battery. The second deformation zone located within the reinforcement rib 3 has concentrated reinforcement to prevent shrinkage and deformation when the internal pressure of the battery changes (below the limited range), resulting in "material fatigue at the notch" rupture and premature valve opening, causing the battery to be scrapped.

[0052] The explosion-proof disc provided in the present application not only improves the structural strength of the explosion-proof disc, but also prevents or reduces the occurrence of deformation of the explosion-proof disc, thereby ensuring the stability of the bursting pressure threshold. When the internal pressure of the battery increases to the threshold of the explosion-proof disc, the explosion-proof disc ruptures normally, allowing the gas inside the battery to be released, thereby ensuring the safety performance of the battery.

[0053] In the first embodiment, the plurality of reinforcing ribs 3 are respectively an arc-shaped reinforcing rib group and a strip-shaped reinforcing rib group, the arc-shaped reinforcing rib group includes a plurality of first circular arc reinforcing ribs and a plurality of second circular arc reinforcing ribs, the plurality of first circular arc reinforcing ribs are respectively located at both ends of the blasting body 2, the strip-shaped reinforcing rib group includes a plurality of linear reinforcing ribs, the plurality of linear reinforcing ribs are located between the plurality of first circular arc reinforcing ribs, and the two ends of each of the first circular arc reinforcing ribs are respectively connected to the linear reinforcing ribs, the plurality of linear reinforcing ribs intersect at one point, or the extension lines of the plurality of linear reinforcing ribs intersect at one point, and the two linear reinforcing ribs located on the same side are connected by the second circular arc reinforcing ribs.

[0054] Specifically, the number of the multiple first arc-shaped reinforcing ribs and the multiple second arc-shaped reinforcing ribs is 2 or more; the number of the multiple linear reinforcing ribs is 2 or more. The multiple first arc-shaped reinforcing ribs, the multiple second arc-shaped reinforcing ribs, and the multiple linear reinforcing ribs do not connect to or intersect the outer edge of the blasting body 2. This ensures uniform strength distribution in the reinforced area of ​​the explosion-proof disk while maintaining the stability of the bursting pressure threshold, ensuring battery safety and simplifying the manufacturing process of the explosion-proof disk. If the multiple first arc-shaped reinforcing ribs, the multiple second arc-shaped reinforcing ribs, and the multiple linear reinforcing ribs connect to or intersect the outer edge of the explosion-proof body 2, the strength near the junction of the outer edge of the explosion-proof body 2 and the notch 4 increases, which in turn increases the difficulty of manufacturing the explosion-proof disk and reduces the life of the mold.

[0055] The arc-shaped reinforcing rib group includes multiple first circular arc reinforcing ribs, each located at each end of the blasting body 2, to enhance the strength of the blasting disk. It is understood that one first circular arc reinforcing rib can be provided at each end of the blasting body 2, or multiple first circular reinforcing ribs can be provided at each end of the blasting body 2. It is also understood that multiple, randomly distributed, figure-8 or gourd-shaped reinforcing structures can also be provided on the blasting body 2, or one or more smaller figure-8 reinforcing structures can be provided within a larger figure-8 reinforcing structure.

[0056] Intersecting each linear rib at a point, or intersecting the extensions of each linear rib at a point, both enhance the structural strength of the rupture disk. However, when each linear rib intersects at a point, the rib processing becomes more difficult, reducing production efficiency and yield. Intersecting the extensions of each linear rib at a point—meaning that none of the linear ribs intersect, and that the extensions of each linear rib intersect at a point—ensures uniform strength across the required areas of the rupture disk structure while also reducing processing complexity and improving the rib's machinability.

[0057] Two adjacent straight reinforcement ribs on the same side are connected by a second arc reinforcement rib, which not only improves the structural strength of the reinforcement rib 3 but also reduces the processing difficulty and improves the machinability of the reinforcement rib 3.

[0058] In the first embodiment, the first deformation zone is formed between the plurality of the first arc reinforcement ribs and the plurality of the straight reinforcement ribs located at the same end; the second deformation zone is formed between the plurality of the second arc reinforcement ribs.

[0059] The first deformation zone has first arc-shaped and linear reinforcement ribs on its sides. These ribs are evenly distributed and moderately reinforced, allowing the valve to open promptly within the specified pressure range in the third deformation zone, improving battery safety. The second deformation zone has two arc-shaped reinforcement ribs on its sides, with concentrated reinforcement to prevent contraction and deformation when the battery's internal pressure fluctuates (below the specified range), leading to premature valve opening due to "material fatigue at the notch" and causing the battery to fail.

[0060] In the first embodiment, the structure formed by the reinforcing ribs 3 is a gourd-shaped structure or an 8-shaped structure, which improves the structural strength of the explosion-proof disk.

[0061] In the first embodiment, the weak zone is arranged on the periphery of the reinforcing rib 3, or the weak zone is arranged on the periphery of the blasting body 2, and the weak zone includes at least one groove 4, and the cross section of the groove 4 is trapezoidal or V-shaped.

[0062] Specifically, the weak zone is disposed on the periphery of the reinforcing rib 3, meaning that the weak zone is disposed on the blasting body 2 and is not connected to the fixing portion 1. The weak zone is disposed on the periphery of the blasting body 2, generally at the connection between the blasting body 2 and the fixing portion 1. It should be noted that the weak zone can also be disposed inside the reinforcing rib 3.

[0063] The weak area is where the pressure inside the battery is too high, exceeding the bearing capacity, and ruptures along the weak area, thereby releasing the gas inside the battery and preventing the risk of battery explosion.

[0064] In the first embodiment, the explosion-proof disk has a runway-shaped structure, and the weak zone is provided at the connection between the fixing portion 1 and the blasting body 2; the fixing portion 1 has a runway-shaped structure. Figure 1 As shown, at least one groove 4 is provided at the connection between the blasting body 2 and the fixing part 1. When there is one groove 4, the groove 4 is annular; when there are multiple grooves 4, the groove 4 is arc-shaped.

[0065] The connection between the blasting body 2 and the fixing portion 1 is provided with a notch 4. If the internal pressure of the battery exceeds the bearing capacity of the notch 4, it will rupture along the notch 4, thereby releasing the internal gas of the battery and preventing the risk of battery explosion. The fixing portion 1 has a runway-shaped structure, and the notch 4 is provided along the connection between the blasting body 2 and the fixing portion 1. When there is only one notch 4, the notch 4 is annular. When there are multiple notches 4, the notch 4 is arc-shaped. It should be noted that when the notch 4 is an arc-shaped structure, the number of notches 4 is greater than or equal to two.

[0066] In some embodiments, the thickness of the fixing portion 1 is 0.4-0.6 mm, and the thickness of the blasting body 2 is 0.15-0.35 mm. The thickness of the blasting body 2 is preferably 0.2-0.25 mm.

[0067] The fixing part 1 is mainly welded in the corresponding explosion-proof groove on the battery shell or the battery top cover. The thickness of the fixing part 1 should be thicker than that of the explosion body 2 to prevent welding through.

[0068] In the first embodiment, as Figure 3 As shown, the cross-section of the groove 4 is trapezoidal or V-shaped, the bottom angle of the trapezoid is 50-90 degrees, and the width of the groove 4 is 0.08-0.12 mm. The groove 4 with a trapezoidal cross-section, a small bottom angle, and a small width facilitates the opening of the explosion-proof valve when the internal pressure of the battery reaches the set explosion value, preventing splashing and providing a good explosion-proof effect.

[0069] In the first embodiment, the thickness of the weakest part of the groove 4 is 0.05-0.1 mm. The thin groove 4 facilitates rupture through the thin groove 4 when the internal pressure of the battery reaches the threshold of the explosion-proof disk, ensuring the release of internal gas and the safety of the battery.

[0070] First groove 41 Second groove 42 First groove 41 Second groove 42 First groove 41 Second groove 42

[0071] The second groove 42, the second groove 42, the second groove 42, and the first groove 41 are formed in the first embodiment. Figure 1 As shown, the plurality of first arc reinforcement ribs are respectively the first semi-circular arc reinforcement rib 301 and the second semi-circular arc reinforcement rib 302, the second arc reinforcement ribs are respectively the first arc segment adjustable reinforcement rib 303 and the second arc segment adjustable reinforcement rib 304, and the plurality of straight line reinforcement ribs are respectively the first straight line segment reinforcement rib 305, the second straight line segment reinforcement rib 306, the third straight line segment reinforcement rib 307 and the fourth straight line segment reinforcement rib 308;

[0072] The first semicircular arc reinforcement rib 301 and the second semicircular arc reinforcement rib 302 are respectively located at the two ends of the blasting body 2, and the center of the first semicircular arc reinforcement rib 301 and the center of the second semicircular arc reinforcement rib 302 are located between the first semicircular arc reinforcement rib 301 and the second semicircular arc reinforcement rib 302; the first straight segment reinforcement rib 305 and the second straight segment reinforcement rib 306 are respectively connected to the two ends of the first semicircular arc reinforcement rib 301 to form a first deformation zone; the third straight segment reinforcement rib 307 and the fourth straight segment reinforcement rib 308 are respectively connected to the two ends of the second semicircular arc reinforcement rib 302 to form another first deformation zone;

[0073] The first straight segment reinforcement rib 305 and the third straight segment reinforcement rib 307 are arranged on the same side, and the first straight segment reinforcement rib 305 and the third straight segment reinforcement rib 307 are connected by the first arc segment adjustable reinforcement rib 303. The second straight segment reinforcement rib 306 and the fourth straight segment reinforcement rib 308 are arranged on the same side, and the second straight segment reinforcement rib 306 and the fourth straight segment reinforcement rib 308 are connected by the second arc segment adjustable reinforcement rib 304. The second deformation zone is formed between the first arc segment adjustable reinforcement rib 303 and the second arc segment adjustable reinforcement rib 304.

[0074] like Figure 1 As shown, the first straight segment reinforcement rib 305, the second straight segment reinforcement rib 306, the third straight segment reinforcement rib 307, and the fourth straight segment reinforcement rib 308 do not intersect, but their extension lines intersect at a point. The first straight segment reinforcement rib 305 and the third straight segment reinforcement rib 307 are connected by the first arc segment adjustable reinforcement rib 303, and the second straight segment reinforcement rib 306 and the fourth straight segment reinforcement rib 308 are connected by the second arc segment adjustable reinforcement rib 304. This not only strengthens the structural strength of the explosion-proof disk but also improves its workability. The first arc segment adjustable reinforcement rib 303 and the second arc segment adjustable reinforcement rib 304 serve as transitional connections.

[0075] like Figure 1 As shown, the blasting body 2 includes a first deformation zone, a second deformation zone, and a third deformation zone; the outer periphery of the reinforcement rib 3 constitutes the third deformation zone. The area formed by the first semicircular reinforcement rib 301, the first straight segment reinforcement rib 305, and the second straight segment reinforcement rib 306 is defined as the first zone, and the area formed by the second semicircular reinforcement rib 302, the third straight segment reinforcement rib 307, and the fourth straight segment reinforcement rib 308 is defined as the second zone. Both the first and second zones constitute the first deformation zone. The area between the first arc segment adjustable reinforcement rib 303 and the second arc segment adjustable reinforcement rib 304 constitutes the second deformation zone.

[0076] In a preferred embodiment, the extension lines of the first straight segment reinforcement rib 305, the second straight segment reinforcement rib 306, the third straight segment reinforcement rib 307 and the fourth straight segment reinforcement rib 308 intersect at one point, and the intersection point is located on the line connecting the centers of the first semicircular arc reinforcement rib 301 and the second semicircular arc reinforcement rib 302, which has the effect of improving the structural strength of the reinforcement rib 3.

[0077] In the first embodiment, the groove 4 is arc-shaped or annular. When the groove 4 is arc-shaped, it comprises at least one arc segment. The ratio of the radius d1 of the first and second semicircular arc reinforcement ribs 301, 302 to the arc segment radius d2 of the groove 4 is (40-60):100, preferably (50-55):100, and more preferably (52-53):100. This range helps improve the mechanical properties of the reinforcement rib 3 and enhances structural strength.

[0078] In the first embodiment, the first arc reinforcement rib, the second arc reinforcement rib and the straight reinforcement rib are all stamped, and the protrusion height of the first arc reinforcement rib on the side away from the battery cell, the protrusion height of the second arc reinforcement rib on the side away from the battery cell and the protrusion height of the straight reinforcement rib on the side away from the battery cell are all 0.08mm~0.12mm, and the width of the first arc reinforcement rib on the side away from the battery cell, the width of the second arc reinforcement rib on the side away from the battery cell and the width of the straight reinforcement rib on the side away from the battery cell are all 0.3mm-0.6mm.

[0079] Specifically, such as Figure 2 As shown, the first arc reinforcement rib, the second arc reinforcement rib, and the linear reinforcement rib are all stamped and formed. Then, the first arc reinforcement rib, the second arc reinforcement rib, and the linear reinforcement rib are all formed in the plane of the explosion body 2, and the side away from the battery cell protrudes to a height of 0.08-0.12mm. At the same time, a groove 5 is formed with the side of the explosion body 2 close to the battery cell, and the depth of the groove 5 is also 0.08-0.12mm. In this way, the first arc reinforcement rib, the second arc reinforcement rib, and the linear reinforcement rib formed by stamping can improve the structural strength of the reinforcement rib 3 and form a certain buffer space, reducing the impact of the internal pressure of the battery on the weakest point of the explosion-proof disk, namely the groove 4. The maximum width of the stamped groove 5 is 0.2-0.5mm, preferably 0.4-0.5mm, so as to form a good buffering effect.

[0080] In the first embodiment, the cross-sections of the first arc reinforcement rib, the second arc reinforcement rib and the straight reinforcement rib are arc-shaped. The cross-section of the groove 5 is also arc-shaped.

[0081] In the first embodiment, the structure of the fixing portion 1 is a runway type, and a first semicircular arc segment and a second semicircular arc segment are provided at both ends of the fixing portion 1. The center of the first semicircular arc segment and the center of the second semicircular arc segment are located between the first semicircular arc segment and the second semicircular arc segment. The projections of the center of the first semicircular arc segment, the center of the second semicircular arc segment, the center of the first semicircular arc reinforcement rib 301 and the center of the second semicircular arc reinforcement rib 302 in the direction of the blasting body 2 are located on the same straight line.

[0082] Specifically, the centers of the first semicircular segment, the second semicircular segment, the first semicircular reinforcement rib 301, and the second semicircular reinforcement rib 302 are located on the same straight line, which can further enhance the structural strength of the explosion-proof disk. Preferably, the projections of the centers of the first semicircular segment, the second semicircular segment, the first semicircular reinforcement rib 301, and the second semicircular reinforcement rib 302 in the direction of the blasting body 2 are located on the same straight line and are close to each other.

[0083] In the first embodiment, one of the angles formed by the intersection of the first, second, third, and fourth straight-segment reinforcing ribs 305, 306, 307, and 308 is angle A1, and one of the angles formed by the intersection of the extensions of the first, second, third, and fourth straight-segment reinforcing ribs 305, 306, 307, and 308 is angle A2. Both A1 and A2 are within a range of 100° to 120°. The angles formed by the intersection or extensions of the four straight-segment reinforcing ribs are all within a range of 100° to 120°. The first, second, third, and fourth straight-segment reinforcing ribs 305, 306, 307, and 308 are structurally sound, thereby enhancing the strength of the explosion-proof disk.

[0084] In a preferred embodiment, the angle formed by the intersection of the first straight segment reinforcing rib 305, the second straight segment reinforcing rib 306, the third straight segment reinforcing rib 307, and the fourth straight segment reinforcing rib 308 is A1, and the angle formed by the intersection of the extension lines of the first straight segment reinforcing rib 305, the second straight segment reinforcing rib 306, the third straight segment reinforcing rib 307, and the fourth straight segment reinforcing rib 308 is A2. A1 ranges from 50° to 70°, and A2 ranges from 130° to 110°. Within the preferred range, the angle formed by the four straight segment reinforcing ribs is more conducive to enhancing the strength of the bursting disk.

[0085] In the first embodiment, the radius of the first arc segment adjustable reinforcing rib 303 and the radius of the second arc segment adjustable reinforcing rib 304 are equal to or similar to the radius of the first semi-circular arc reinforcing rib 301, and / or equal to or similar to the radius of the second semi-circular arc reinforcing rib 302. This restriction can further enhance the cushioning effect of the groove 5.

[0086] In the first embodiment, further, the explosion-proof disk includes at least one of the following technical features a to k:

[0087] a. The weak area has a notch 4, which is generally annular or annular with a gap; that is, the notch 4 is annular or annular with a gap, such as an arc. When the notch is annular, as in the fourth embodiment of this application, it can prevent the rupture zone from splashing when the explosion-proof disk explodes due to a rapid increase in the internal pressure of the battery cell. The notch can avoid or reduce splashing of the explosion-proof disk, and can also control the opening direction of the explosion-proof disk to a certain extent.

[0088] b. The reinforcing rib 3 and the reinforcing area are both located within the weak area and are both located within the annular interior formed by the groove 4. In this way, when the reinforcing rib 3 and the reinforcing area are both located within the weak area, the reinforcing rib 3 and the reinforcing area can be further concentratedly reinforced to prevent shrinkage and deformation when the internal pressure of the battery changes (not reaching the specified range), resulting in "material fatigue at the groove 4" rupture and premature valve opening, causing the battery to be scrapped.

[0089] c. The explosion-proof disk has a racetrack shape as a whole; of course, the explosion-proof disk of the present application can also be circular.

[0090] d. The width-to-length ratio of the runway-shaped explosion-proof disk is between 1 / 3 and 2 / 3, but is not limited thereto. Specifically, when the width-to-length ratio of the runway-shaped explosion-proof disk is between 1 / 3 and 2 / 3, and the reinforced area formed by the approximately "8"-shaped reinforcing ribs 3 therein is combined, it can further strengthen the explosion-proof valve, reducing the impact of normal battery operation, such as extrusion or gas production, on the explosion-proof valve, thereby maintaining a normal explosion-proof threshold.

[0091] e. The weak zone has a notch 4, which is either annular or notched. Both the notch and notch have a racetrack shape. The notch can also be understood as a racetrack shape. The notch prevents a rapid increase in internal pressure in the cell, which could cause splashing from the rupture zone during an explosion. The notch prevents or reduces splashing from the explosion-proof disk, and also controls the direction of the disk's opening to a certain extent.

[0092] f. The reinforcing ribs 3 enclose a closed-loop reinforcement area, or the reinforcing ribs 3 enclose a mostly closed-loop reinforcement area with a gap; it can also be understood that the "8"-shaped reinforcement area given in the drawings can be completely closed or in an incompletely closed state with a slight gap.

[0093] g. The shape of the reinforced area before shrinkage is runway-shaped, and the shrinkage area of ​​the reinforced area is at least one side of the runway-shaped straight-edge area; it should be noted that the present application defines the shrinkage area of ​​the reinforced area before shrinkage and after relative shrinkage, mainly to facilitate the understanding of the description of the shape of the reinforced area. It should be understood that it is not an actual limitation on the process of the reinforced area. Specifically, the shape of the reinforced area before shrinkage is runway-shaped, which can also be understood as the shape of the reinforced area before shrinkage is consistent with or close to the runway shape of the explosion-proof plate, and is runway-shaped or roughly runway-shaped as a whole. The shrinkage area of ​​the reinforced area is at least one side of the runway-shaped straight-edge area, that is, one side of the straight-edge area can be shrunk, and of course, both straight-edge areas can be shrunk to form Figure 4 Similar shape.

[0094] h. The shape of the reinforced area before shrinkage is runway-shaped, and the shrinkage area of ​​the reinforced area is on both sides of the runway-shaped straight edge area; that is, both sides of the runway-shaped straight edge area are shrunk, that is, formed into Figure 4 Specifically, the minimum diameter of the contracted area after contraction is 1 / 6 to 1 / 2 of the width before contraction. Of course, since the contracted area is located in the runway-shaped straight-edge area, the width before contraction is the distance between the two straight-edge areas before contraction. By reducing the minimum diameter of the contracted area after contraction to 1 / 6 to 1 / 2 of the width before contraction, the explosion-proof disk can be further strengthened, thereby better maintaining the explosion-proof threshold of the explosion-proof groove 4.

[0095] i. The reinforced area is runway-shaped before contraction, and the contracted area is the entire straight-side area of ​​the runway-shaped straight-side area. In this way, the entire straight-side area is contracted, which can provide better protection and maintain the normal function of the explosion-proof disk.

[0096] j. The minimum diameter of the contraction region is located in the middle of the rupture-proof disk. Thus, a relatively short reinforcement rib 3 is formed in the middle of the rupture-proof disk, further strengthening the middle portion and avoiding stress concentration, thereby providing better protection and maintaining the normal function of the rupture-proof disk.

[0097] k. The weak zone comprises a groove 4, which is generally in the shape of a runway ring or a runway ring with a notch. The reinforced area, before contraction, is in the shape of a runway. The contracted area of ​​the reinforced area encompasses the entire straight edge of the runway shape. The distance between the runway shape of the reinforced area and the groove 4, before contraction, is 1 / 5 to 3 / 5 of the width of the runway ring. Applicants have discovered that the reinforced area formed by contraction of the reinforcing rib 3 of the aforementioned dimensions provides improved protection and maintains the proper function of the explosion-proof disk.

[0098] In the second embodiment, only the number and arrangement of the grooves 4 differ from the first embodiment; the remainder of the arrangement is the same. Specifically, multiple grooves 4 are provided at the connection between the blasting body 2 and the fixing portion 1. When there are multiple grooves 4, each groove 4 is arc-shaped. The multiple grooves 4 are spaced apart at the connection between the blasting body 2 and the fixing portion 1.

[0099] The plurality of grooves 4 are spaced apart at the connection between the blasting body 2 and the fixing portion 1 . The portion between two adjacent grooves 4 prevents the internal pressure of the battery from rising rapidly and splashing in the rupture zone when the explosion-proof disk explodes.

[0100] like Figure 6-7 As shown, in the third embodiment, only the number and arrangement of the grooves 4 differ from the first embodiment, with all other features remaining the same. Specifically, multiple grooves 4 are provided at the connection between the blasting body 2 and the fixing portion 1. When there are multiple grooves 4, the grooves 4 are arc-shaped. The grooves 4 include a first groove 41 and a second groove 42. The depth of the first groove 41 is less than that of the second groove 42, and the first groove 41 and the second groove 42 are spaced apart.

[0101] Specifically, at the connection between the blasting body 2 and the fixed portion 1, a first groove 41 and a second groove 42 are annularly spaced along the outer circumference of the blasting body 2, and the first and second grooves 41 and 42 lie on the same annular line. The depth of the first groove 41 is less than that of the second groove 42, which is deeper. When the internal pressure of the battery reaches the tolerance of the second groove 42, that is, when the internal pressure of the battery reaches the threshold of the explosion-proof disk, it facilitates rupture through the deeper second groove 42, ensuring the release of internal gas and maintaining battery safety. The first groove 41 prevents a rapid increase in internal pressure in the battery and splashing from the rupture zone when the explosion-proof disk explodes.

[0102] like Figure 4-5As shown, in the fourth embodiment, only the structure and arrangement of the groove 4 are different from those of the first embodiment, and the rest are the same. Specifically, a groove 4 is provided at the connection between the blasting body 2 and the fixing part 1. When there is only one groove 4, the groove 4 is an arc-shaped structure. Specifically, an arc-shaped groove 4 is provided at the connection between the blasting body 2 and the fixing part 1, and the arc-shaped groove 4 is provided around the connection between the blasting body 2 and the fixing part 1. Figure 4 As shown, the arc-shaped groove 4 includes a first end and a second end, the first end being the head of the arc-shaped groove 4, and the second end being the tail of the arc-shaped groove 4. No groove 4 is provided between the first end and the second end. This structure has the function of preventing the internal pressure of the battery from rising rapidly and splashing in the rupture zone when the explosion-proof disk explodes.

[0103] It should be noted that the number of the plurality of grooves 4 in the above embodiment refers to at least two grooves 4 .

[0104] In another aspect, the present application provides a battery comprising the explosion-proof disk described above.

[0105] In the battery provided in the present application, the explosion-proof plate is welded in the explosion-proof groove of the battery. While improving the structural strength of the explosion-proof plate, it also prevents or reduces the occurrence of deformation of the explosion-proof plate, ensuring the stability of the bursting pressure threshold. When the internal pressure of the battery increases to the threshold of the explosion-proof plate, the explosion-proof plate ruptures normally, allowing the gas inside the battery to be released, thereby ensuring the safety performance of the battery.

[0106] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention and are intended to be included within the scope of protection of the present invention.

Claims

1. A burst-proof disk, characterized in that: The blasting body comprises a blasting body having a weak area and a plurality of reinforcing ribs formed thereon, wherein the reinforcing ribs are formed with grooves on one side of the blasting body and with protrusions on the other side of the blasting body, wherein the reinforcing ribs at least partially enclose a reinforced area, and a portion of the reinforced area is contracted toward the middle of the reinforced area; The plurality of reinforcing ribs do not intersect with the outer periphery of the blasting body, and the plurality of reinforcing ribs enclose the reinforced area, and the reinforced area includes two first deformation zones, the two first deformation zones are connected, and the first deformation zones shrink in a first direction toward a direction close to the connection between the two first deformation zones; Alternatively, a plurality of the reinforcing ribs enclose the reinforcing region, the reinforcing region includes a second deformation zone and two first deformation zones, the second deformation zone is arranged between the two first deformation zones, and the first deformation zone shrinks in a first direction toward the second deformation zone; The plurality of reinforcing ribs are respectively an arc-shaped reinforcing rib group and a strip-shaped reinforcing rib group. The arc-shaped reinforcing rib group includes a plurality of first arc-shaped reinforcing ribs and a plurality of second arc-shaped reinforcing ribs. The plurality of first arc-shaped reinforcing ribs are respectively located at both ends of the blasting body. The strip-shaped reinforcing rib group includes a plurality of linear reinforcing ribs. The plurality of linear reinforcing ribs are located between the plurality of first arc-shaped reinforcing ribs, and the two ends of each first arc-shaped reinforcing rib are respectively connected to the linear reinforcing rib. The plurality of linear reinforcing ribs intersect at one point. Alternatively, the extension lines of the plurality of linear reinforcing ribs intersect at one point, and the two linear reinforcing ribs on the same side are connected by the second circular arc reinforcing rib.

2. The explosion-proof disk according to claim 1, wherein: The plurality of first arc reinforcement ribs are respectively the first semi-circular arc reinforcement ribs and the second semi-circular arc reinforcement ribs, the plurality of second arc reinforcement ribs are respectively the first arc segment adjustable reinforcement ribs and the second arc segment adjustable reinforcement ribs, and the plurality of straight line reinforcement ribs are respectively the first straight line segment reinforcement ribs, the second straight line segment reinforcement ribs, the third straight line segment reinforcement ribs and the fourth straight line segment reinforcement ribs; The first semicircular arc reinforcement rib and the second semicircular arc reinforcement rib are respectively located at two ends of the blasting body, and the center of the first semicircular arc reinforcement rib and the center of the second semicircular arc reinforcement rib are located between the first semicircular arc reinforcement rib and the second semicircular arc reinforcement rib; the first straight segment reinforcement rib and the second straight segment reinforcement rib are respectively connected to the two ends of the first semicircular arc reinforcement rib to form a first deformation zone; the third straight segment reinforcement rib and the fourth straight segment reinforcement rib are respectively connected to the two ends of the second semicircular arc reinforcement rib to form another first deformation zone; The first straight segment reinforcement rib and the third straight segment reinforcement rib are arranged on the same side, and the first straight segment reinforcement rib and the third straight segment reinforcement rib are connected by the first arc segment adjustable reinforcement rib. The second straight segment reinforcement rib and the fourth straight segment reinforcement rib are arranged on the same side, and the second straight segment reinforcement rib and the fourth straight segment reinforcement rib are connected by the second arc segment adjustable reinforcement rib. The second deformation zone is formed between the first arc segment adjustable reinforcement rib and the second arc segment adjustable reinforcement rib.

3. The explosion-proof disk according to claim 2, characterized in that The extension lines of the first straight segment reinforcement rib, the second straight segment reinforcement rib, the third straight segment reinforcement rib and the fourth straight segment reinforcement rib intersect at one point, and the intersection point is located on the line connecting the centers of the first semicircular arc reinforcement rib and the second semicircular arc reinforcement rib.

4. The explosion-proof disk according to claim 3, characterized in that The weak area is arranged on the periphery of the reinforcing rib, or the weak area is arranged on the periphery of the blasting body, and the weak area includes at least one groove, and the cross section of the groove is trapezoidal or V-shaped.

5. The explosion-proof disk according to claim 4, characterized in that The explosion-proof disk further comprises a fixing portion, which is arranged on the periphery of the blasting body, and the weak zone is arranged at the connection between the fixing portion and the blasting body; the fixing portion has a runway-shaped structure. When the number of the groove is one, the groove is annular or arc-shaped; When there are multiple grooves, each groove is arc-shaped, and multiple grooves are arranged at intervals at the connection between the blasting body and the fixing part.

6. The explosion-proof disk according to claim 4, characterized in that The grooves include a first groove and a second groove, the depth of the first groove is smaller than the depth of the second groove, and the first groove and the second groove are spaced apart.

7. The explosion-proof disk according to claim 5, characterized in that A first semicircular arc segment and a second semicircular arc segment are provided at both ends of the fixing portion, the center of the first semicircular arc segment and the center of the second semicircular arc segment are located between the first semicircular arc segment and the second semicircular arc segment, and the projections of the center of the first semicircular arc segment, the center of the second semicircular arc segment, the center of the first semicircular arc reinforcement rib and the center of the second semicircular arc reinforcement rib in the direction of the blasting body are located on the same straight line.

8. The explosion-proof disk according to claim 1, wherein: The first arc reinforcement rib, the second arc reinforcement rib and the straight reinforcement rib are all stamped, and the protrusion height of the first arc reinforcement rib on the side away from the battery cell, the protrusion height of the second arc reinforcement rib on the side away from the battery cell and the protrusion height of the straight reinforcement rib on the side away from the battery cell are all 0.08mm~0.12mm, and the width of the first arc reinforcement rib on the side away from the battery cell, the width of the second arc reinforcement rib on the side away from the battery cell and the width of the straight reinforcement rib on the side away from the battery cell are all 0.3mm-0.6mm.

9. The explosion-proof disk according to claim 1, wherein: The bursting disk includes at least one of the following technical features a to k: a. The weak area has a groove, the groove is annular as a whole or annular with a gap; b. The reinforcing ribs and the reinforcing area are located within the weak zone and are located within the annular portion formed by the groove; c. The explosion-proof disk has a runway-shaped shape as a whole; d. The width-to-length ratio of the runway-shaped explosion-proof disk is 1 / 3 to 2 / 3; e. The weak area has a groove, the groove is annular as a whole or annular with a gap, the annular or the annular with a gap has a runway shape; f. The reinforcing ribs enclose a reinforced region forming a closed loop, or the reinforcing ribs enclose a reinforced region forming a mostly closed loop having a gap; g. The shape of the strengthening region before contraction is runway-shaped, and the contraction region of the strengthening region is at least one side of the runway-shaped straight edge region; h. The reinforced region has a runway-shaped shape before shrinkage, and the shrinkage region of the reinforced region is on both sides of the runway-shaped straight-edge region; the minimum diameter of the shrinkage region after shrinkage is 1 / 6 to 1 / 2 of the width before shrinkage; i. The strengthening region is in a runway-shaped shape before shrinkage, and the shrinkage region is the entire straight-edge region of the runway-shaped straight-edge region; j. The minimum diameter of the contraction area is located in the middle of the burst disk; k. The weak area has a groove, and the groove is in the shape of a runway ring as a whole or a runway ring with a notch. The shape of the reinforced area before shrinkage is runway-shaped. The shrinkage area of ​​the reinforced area is the entire straight-edge area of ​​the runway-shaped straight-edge area. The distance between the runway-shaped area of ​​the reinforced area before shrinkage and the grooved runway ring is 1 / 5 to 3 / 5 of the width of the grooved runway ring.

10. A battery, characterized in that: The explosion-proof disk comprises the explosion-proof disk according to any one of claims 1 to 9.

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